Abstract
This paper intends to investigate punching shear bearing capacity formula of anchorage with embedded steel anchor between transmission tower legs and four-piles-supported footings or spread foundations, subjected to push-in load. At first we made several push-in loading tests about four-piles-supported footings, and studied simplified bearing capacity formula of punching shear. And then we simulated the normal case of these experiments using COM3, which is a three-dimensional finite element program, and we assured that COM3 can simulate ultimate load and failure mode well. At last using COM3, we examined punching shear bearing capacity of anchorage of an anchor in a spread foundation subjected to push-in load.
